後ろ

1. Origins, structure, and basic meaning

• Structure: 後ろ, read うしろ, is a positional noun for the side opposite the facing direction of a person or object.
• Basic usage: It marks the back of a reference point in 駅の後ろ or the direction an action comes from in 後ろから呼ぶ.

2. Common pitfalls and similar expressions

• Grammar and combinations
  • The back changes with the orientation of a person or object, so it is a relative position rather than a fixed compass direction.